'71 Volvo rough idle
Hi all. I have a '71 Volvo 1800 that has a strange idling problem. When I first start it up, it idles fine, but then all of a sudden, around 30 seconds or so into idling, it drops down significantly. It's a 4 cylinder engine and 2 of the spark plugs have white tips, but all of the injectors are "squirting" appropriately. Does anyone have any idea why this might be happening? Thanks!
Scroll down to color chart, find your plugs, and read what it means.
Wanted to say - you run lean on those 2 plugs, ha-ha, indeed:
A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. k This is often caused by over advanced ignition, timing, poor engine cooling system efficiency (scale, stoppages, low level), a very lean air/fuel mixture, or a leaking intake manifold. When these conditions prevail, even a plug of the correct heat range will overheat.
Clean fuel injectors.
Sounds like you have a vacuum leak. With the engine idling, spray mist of water around the engine area. The engine will start to die or run rough if the leaking area gets sprayed
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